5.2 magnum GT35 to S475

That’s an .0075 ring gap factor. That’s a top ring gap factor most ring manufacturers spec for big boost, big nitrous, serious drag race stuff. I use .007xbore for just about everything and I’ve made big power there on boost and never butted rings. I think it’s safe to say at least that 5.2 would be ok with lots of boost.
It’s just a theory I have, and I could be wrong…. But I almost wonder if 5.2s have more boost pressure capability before blowing head gaskets than 5.9s due to the increased deck area from the smaller bore. Kinda like 4.8 and 5.3 is the “golden child” of sbe ls stuff. Smaller bore than ls1 6.0 etc so the cylinder head can clamp better. Maybe I’m wrong and it’s just a coincidence.